The night I went to see the mega block he was building a shipping box for it to ship out of state. It was 4.500 bore. The 440source assembly I had was .055 so I called Brandon and bought a set of .030 pistons for it. I couldn’t justify boring it just because I had .055 pistons. They are to hard to come by so I tossed those pistons on a shelf till I need them. When I first built my Keith Black block i had the pistons cut so I could run both my 440-1 heads and B1 heads on it. I bought a set of nitrous pistons from Jason Digsby when he switched over to turbos so they are in it now with a 7.150 aluminum rod